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A research team from the Innovation Academy for Precision Measurement Science and Technology, under the Chinese Academy of Sciences, has successfully developed a second-generation optical clock that utilizes liquid-nitrogen cryogenic calcium ions. This remarkable timepiece boasts an uncertainty of just 4.4×10^-19, meaning it would take over 72 billion years to accumulate an error of no more than a single second. This level of precision places it at the forefront of global technology. The successful development of this clock validates the feasibility of employing liquid-nitrogen cryogenic technology, marking a significant advancement with far-reaching implications for fundamental scientific research, metrological applications, and various engineering domains.
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